Modem with enhanced echo canceler

Details Modem with enhanced echo canceler Modem with enhanced echo canceler

2006-02-21

2006-02-21

Kuntz, Curtis (Department: 2643)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406060

Reexamination Certificate

active

07003100

ABSTRACT:
A modem incorporating apparatus and methods to achieve computationally efficient echo cancellation. The apparatus include a cyclic echo synthesizer sub-canceler in the time domain and a echo canceler in the frequency domain. The method includes generating a cyclic echo synthesizer signal using a sub-canceler structure, adding the cyclic echo synthesizer signal to a receive signal in the time domain, generating an echo cancellation signal, and subtracting the echo cancellation signal from the receive signal in the frequency domain. The apparatus and methods may be used for echo cancellation in an asynchronous digital subscriber line (ADSL) modem using discrete multi-tone (DMT) technology.

REFERENCES:
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patent: 6240128 (2001-05-01), Banerjea et al.
Richard C. Younce, Peter JW Melsa, Samie Kapoor, Echo Canceller for Asymmetrical Digital Subscriber Lines, 1994, IEEE, ICC 94, SUPERCOMM/ICC '94, Conference Record, Serving Humanity Through Communications. IEEE International Conference,pp.: 301-306.
J. Cioffi and J. Bingham, “A Data Multitone Echo Canceller”, IEEE Transaction on Communications, vol. 42, No. 10, Oct. 1994, pp. 2853-2869.
M. Schlegel, Technical Educational Institute of Piraeus, Department of Electronics, High Bit Rate Data Transmission over the Telephone loop plant—Emphasis on DMT Modulation Scheme (Diploma Thesis), Chapter 6, [online], [retrieved on Jul. 16, 2001], retrieved form the Internet :<URL: http:/www.fh-lippe.del˜wayne1/chapter6.html.

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